Multi-bulb Passive Anchor

The multi-bulb passive anchor is a flexible, high tensile steel strand of a specific length, anchored inside a drilled hole, with an innovative multi-coloured breathing tube system.

The advantages of using this breathing tube system in a vertical crater retreat mining operation is that once a round has been blasted, the remaining coloured breather tube indicates the actual depth of the blast.

Multi-bulb passive anchors are made to requirements as specified by the end user. These anchors were designed as a support for vertical crater retreat mining operations and are normally grouted, but not pre-stressed, thus aptly named as passive anchors.